1-Hydroxybenzotriazole → N-[3-[(4aR,7aS)-2-Benzamido-6-(5-fluoropyrimidin-2-yl)-4,4a,5,7-tetrahydropyrrolo[3,4-d][1,3]thiazin-7a-yl]-4-fluoro-phenyl]-5-methoxy-pyrazine-2-carboxamide

Participants

Reaction Steps

N-[(4aR,7aS)-7a-(5-Amino-2-fluoro-phenyl)-6-(5-fluoropyrimidin-2-yl)-4,4a,5,7-tetrahydropyrrolo[3,4-d][1,3]thiazin-2-yl]benzamide (0.361 g, 0.77 mmol, isomer 1) is dissolved in a mixture of dichloromethane (4 mL) and DMF (0.5 mL). 5-Methoxypyrazine-2-carboxylic acid (240 mg, 1.55 mmol), 1-hydroxybenzotriazole (210 mg, 1.55 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (300 mg, 1.55 mmol) are added to the mixture and the mixture is stirred overnight at room temperature. The reaction solution is added directly onto a 12 g silica gel loading column and purified using a 40 g silica gel column and eluting with a 0-100% ethyl acetate/hexanes gradient. The product is dissolved in ethyl acetate (200 mL), washed with 1 N NaOH (2×50 mL), and with brine (1×50 mL). The silica gel purification is repeated as described above to give the title compound (350 mg, 74%). ES/MS (m/e): 603 (M+H).

Provenance & Evidence